Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

21968 results found.

  1. GRB060904B: Watcher observations
  2. GRB 060904B BOOTES-IR and 1.5m OSN observations
  3. GRB 060904B: TAROT optical counterpart observations
  4. GRB060904B - SDSS Pre-Burst Observations
  5. GRB 060904: TAROT optical observations
  6. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  7. GRB060904 - SDSS Pre-Burst Observations
  8. GRB060901: Optical observations
  9. 060901: Swift UVOT followup observations
  10. GRB 060901: SMARTS optical/IR observations update
  11. GRB 060901: Swift/XRT Refined Analysis
  12. GRB 060901: SMARTS optical/IR observations
  13. GRB 060901: Swift/XRT Position
  14. GRB 060901: Watcher observations
  15. GRB 060605, observations using an Integral Field Unit
  16. GRB 060825: VLA observations
  17. GRB060826 - SDSS Pre-Burst Observations
  18. GRB060825: Liverpool Telescope optical observations
  19. GRB 060825: TNG optical observations
  20. GRB 060825: TAROT optical observations
  21. GRB 060825: P60 Observations
  22. GRB060825: BOOTES-IR optical observations
  23. GRB060801: host galaxy redshift
  24. Radio observations of GRB 060719
  25. GRB 060729, SMARTS optical/IR observations
  26. GRB 060814: Confirmation of IR afterglow
  27. GRB 060814: P60 Observations
  28. GRB 060814: P200 NIR Observations
  29. GRB 060814: Possible IR counterpart
  30. GRB060805B: optical observations
  31. GRB 060814: VLT optical limits
  32. GRB 060814 - SDSS Pre-Burst Observations
  33. GRB 060814: TAROT optical observations
  34. GRB051109B: Late-time Radio Observations
  35. Second VLA limit on new radio point source in SGR 1806-20
  36. GRB060807: Possible Highly Significant X-ray Emission Lines
  37. GRB060714: optical observations
  38. GRB 060729: An update on the Swift XRT and UVOT observations
  39. GRB060717: optical observations
  40. GRB060807: Optical limiting magnitudes
  41. GRB 060805B: XRT Team Analysis
  42. GRB 060807: K- and R-band observations
  43. GRB060806 = SGR1806-20
  44. GRB060807 - SDSS Pre-burst Observations
  45. GRB 060807: Kanazawa R-band observation
  46. GRB 060801: Second Epoch WSRT Radio Observations
  47. GRB060805 Liverpool Telescope observations
  48. GRB 060805: P60 Observations
  49. GRB 060805: KAIT observations
  50. GRB 060805 - SDSS Pre-Burst Observations
  51. GRB 060804: Swift UVOT observations
  52. GRB 060728: Upper limits of the X-ray emission
  53. GRB 060801: WSRT Radio Observations
  54. GRB060801: Radio Observations
  55. GRB 051109B: Bright spiral host galaxy at low redshift
  56. GRB 060801: optical observations at FORS2/VLT
  57. GRB 060801: optical observations at Hanle and Calar Alto
  58. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  59. GRB 060218 / SN 2006aj Nebular Spectrum
  60. GRB 060729 redshift
  61. GRB 060729: Swift/UVOT Observations
  62. GRB 060728, SMARTS optical/IR observations
  63. Swift/XRT preliminary analysis
  64. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  65. GRB 060714: Swift/UVOT Observations
  66. GRB060719: prompt NIR observations with REM
  67. GRB 060714: NOT observations
  68. GRB 060719: near-infrared afterglow
  69. GRB 060719: VLT/ISAAC observations
  70. GRB 060719: further analysis of VLT observations
  71. GRB 060719: prompt PROMPT observations
  72. GRB060719: REM NIR Observations
  73. GRB 060719: Continued LCO optical observations
  74. GRB 060719: VLT observations
  75. GRB 060719: LCO optical observations
  76. GRB060714: optical observations
  77. GRB 060717: NOT observations
  78. GRB060717 - SDSS Pre-burst Observations
  79. GRB 060714: REM infrared observations
  80. GRB060714: optical observations
  81. GRB 060714 : Liverpool Telescope Observations
  82. GRB 060708: VLT spectroscopy
  83. GRB060708: MARGE low resolution spectrum observations
  84. GRB060714: optical observations
  85. GRB 060605: SkyNet Optical Limits
  86. GRB060712: P60 Observations
  87. GRB 060712: Swift/UVOT Upper Limits
  88. GRB060526: optical observations
  89. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  90. GCN 060708: Swift-UVOT Observations
  91. GCN 060707: Swift-UVOT observations
  92. GRB 060707: BOOTES-IR optical observation
  93. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  94. GRB 060515: Upper Limit on Host Galaxy
  95. GRB 050223: Magellan redshift
  96. GRB 060614: SMARTS host galaxy observations
  97. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  98. GRB 060109: Upper Limit on Host Galaxy
  99. GRB 060105: Upper limit on Host Galaxy
  100. GRB060614: Detection of the host galaxy but no supernova emission

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov